<!--
 * @Autor: cp
 * @Description: 
 * @Date: 2024-05-26 00:01:13
 * @LastEditors: cp
 * @LastEditTime: 2024-09-30 15:41:01
-->
<template>
  <div style="display:flex;">
    <el-input type="text" value="" prefix-icon="Message" v-model="val" placeholder="请输入验证码"
    style="color: black; font-size:14px; margin-right: 8px;height: 38px;width: 50%;" />
    <canvas id="canvas" width="100" height="36"  @click="dj" style="border: 1px solid #ccc;border-radius: 5px; background-color: aliceblue;"></canvas>
  </div>
</template>
<script setup>
import { reactive, ref, computed, onMounted } from "vue";
const emits = defineEmits(['sublim'])
let val=ref('')
let num=ref('')
let show_num=ref([])
let Childsublim =()=> {
       num.value = show_num.value.join("");
      if (val.value == '') {
         ElMessage.error("请输入验证码");
        return false
      } else if (val.value.toUpperCase() ==num.value.toUpperCase()) {
       val.value = ''
       draw(show_num.value);
        return true
      } else {
         ElMessage.error("校验失败");
        return false
      }
}
let dj=()=>{
       console.log(1)
     draw(show_num.value);
}
let  draw=(show_num)=> {
      let canvas_width = document.getElementById('canvas').clientWidth;
      let canvas_height = document.getElementById('canvas').clientHeight;
      let canvas = document.getElementById("canvas");//获取到canvas的对象，演员
      let context = canvas.getContext("2d");//获取到canvas画图的环境，演员表演的舞台
      canvas.width = canvas_width;
      canvas.height = canvas_height;
      let sCode = "A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0,q,w,e,r,t,y,u,i,o,p,a,s,d,f,g,h,j,k,l,z,x,c,v,b,n,m";
      let aCode = sCode.split(",");
      let aLength = aCode.length;//获取到数组的长度

      for (let i = 0; i <= 3; i++) {
        let j = Math.floor(Math.random() * aLength);//获取到随机的索引值
        let deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
        let txt = aCode[j];//得到随机的一个内容
        show_num[i] = txt;
        let x = 10 + i * 20;//文字在canvas上的x坐标
        let y = 20 + Math.random() * 8;//文字在canvas上的y坐标
        context.font = "bold 23px 微软雅黑";

        context.translate(x, y);
        context.rotate(deg);

        context.fillStyle = randomColor();
        context.fillText(txt, 0, 0);

        context.rotate(-deg);
        context.translate(-x, -y);
      }
      for (let i = 0; i <= 5; i++) { //验证码上显示线条
        context.strokeStyle = randomColor();
        context.beginPath();
        context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
        context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
        context.stroke();
      }
      for (let i = 0; i <= 30; i++) { //验证码上显示小点
        context.strokeStyle = randomColor();
        context.beginPath();
        let x = Math.random() * canvas_width;
        let y = Math.random() * canvas_height;
        context.moveTo(x, y);
        context.lineTo(x + 1, y + 1);
        context.stroke();
      }
    }

    //  得到随机的颜色值
    let randomColor=()=>{//得到随机的颜色值
      let r = Math.floor(Math.random() * 256);
      let g = Math.floor(Math.random() * 256);
      let b = Math.floor(Math.random() * 256);
      return "rgb(" + r + "," + g + "," + b + ")";
      }
onMounted(()=>{
 draw(show_num.value);
  emits('sublim');
})
defineExpose({Childsublim})
</script>